JP5341811B2 - LED lighting device - Google Patents

Description

  The present invention relates to an illuminating device using an LED (light emitting diode), and more particularly to an LED illuminating device having the appearance of a straight tube fluorescent lamp.

  An LED is used as a light source for an illuminating device replacing a fluorescent lamp because it has a long life and requires little replacement. There exists a thing of the following patent document 1 as a fluorescent lamp type LED illumination tube with which a fluorescent lamp fixture (fluorescent lamp fixture) is mounted instead of a straight tube fluorescent lamp. In this LED lighting tube, the current supplied from the ballast of the fluorescent lamp fixture is rectified by the rectifier, and the LED is conducted to the LED block arranged in series and parallel, so that it can be attached to the existing fluorescent lamp fixture. .

  However, when the power is supplied from the ballast, the brightness and efficiency are affected by the output voltage of the ballast, and the overall efficiency is not significantly increased due to the loss of efficiency in the ballast. In the LED lighting unit, the entire straight tube fluorescent lamp and the LED lighting unit are exchanged. This LED lighting unit includes an airtight main body case in which an LED board is slidably assembled in a longitudinal direction via a guide rail, an illumination base that slidably supports the main body case, and a vent hole in a part of the main body case. And a waterproof ventilation sheet attached to the ventilation hole and an elastic member that presses the LED substrate in the longitudinal direction in the main body case.

JP 2007-257828 A Utility Model Registration No. 3142817

  However, the LED has a problem that when the temperature rises without being able to dissipate the generated heat well, the lifetime becomes extremely short. In order to cope with this problem, in the LED lighting tube described in Patent Document 1, Although the ventilation hole is provided in the upper part of the pipe portion and the ventilation fan is provided inside, there is a problem that the ventilation fan consumes electric power. Moreover, although the LED lighting unit described in Patent Document 2 tries to release the heat inside the main body case by circulating air inside and outside the main body case through the ventilation sheet, the thermal conductivity of air is very low. After all, there was a problem that heat could not be sufficiently dissipated.

  The present invention solves the above-described problems, and can be replaced with the entire straight tube fluorescent lamp without changing the appearance image of the conventional straight tube fluorescent lamp, without consuming power for heat dissipation. An object of the present invention is to provide an LED lighting device that can sufficiently dissipate the heat of an LED and that can maintain a long life of the LED.

The LED lighting device of the present invention includes a lamp body having an aluminum power circuit housing and a lighting section that can be attached to and detached from the lamp body, and the lighting section is based on an aluminum plate. A long LED substrate on which the LEDs are disposed, an aluminum long base portion with the LED substrate attached to the lower surface, and the base portion so that at least the upper surface of the base portion is exposed. It is mounted and a elongated cover that covers the LED substrate, the power supply circuit unit accommodating body, the power to convert the AC current is connected to an external AC power source into a direct current to emit the LED accommodating a circuit portion, in a state where the illumination section is attached to the lamp body unit, together with the upper surface of the base portion comes into contact with the lower surface of the power supply circuit unit accommodating body, the cover and the power supply circuit unit accommodating body Underside of Side end face along the longitudinal direction of the base portion is characterized by being configured so as to be exposed during.

  According to this, the heat generated in the LED is conducted to the base part via the LED substrate, further conducted to the lamp body part via the base part, and is dissipated in both the base part and the lamp body part. The heat of the LED can be sufficiently dissipated without consuming electric power for heat dissipation, and the LED can maintain a long life. In addition, the LED lighting device of the present invention emits an LED by connecting an illuminating part having a long cover to a long base part to which a long LED substrate is attached to an external power source. Since it is mounted on a lamp body having a power supply circuit section to be changed, it can be replaced with the entire straight tube fluorescent lamp without changing the appearance image of the conventional straight tube fluorescent lamp.

  Here, it is preferable that the LED substrate is bonded to the base portion with an adhesive having thermal conductivity.

  According to this, since a minute gap between the LED substrate and the base portion is filled with the adhesive having thermal conductivity, heat is more easily transmitted from the LED substrate to the base portion.

  Moreover, it is preferable that the said illumination part is attached or detached by sliding to the left-right direction with respect to the said lamp body part.

  According to this, in a state where the LED lighting device is attached to the ceiling, there is no possibility that the illuminating unit is detached from the lamp main body due to its own weight.

  And a board-side connector part provided in the illumination part and connected to the LED board; and a power-side connector part provided in the lamp body part and connected to the power circuit part. It is preferable that the board side connector unit and the power source side connector unit are connected to each other when the illumination unit is slid with respect to the lamp main unit and attached to the lamp main unit.

  According to this, the connection between the power supply circuit unit and the LED substrate is easy.

  Moreover, it is preferable that the unevenness | corrugation which diffuses the light from said LED is formed in the inner surface of the said cover.

  According to this, since the light from the LED is diffused, it is possible to illuminate a wide range and reduce glare.

  Moreover, it is preferable that the light diffusion sheet which diffuses the light from the LED is disposed along the inner surface of the cover in the illumination unit.

  According to this, since the light from the LED is diffused, it is possible to illuminate a wide range and reduce glare.

  According to the LED lighting device of the present invention, the entire straight tube fluorescent lamp can be replaced without changing the appearance image of the conventional straight tube fluorescent lamp, and the heat of the LED can be sufficiently consumed without consuming power for heat dissipation. It is possible to dissipate heat and the LED can maintain a long life.

It is a front view of the LED lighting apparatus which concerns on one Embodiment of this invention. It is a perspective view of the LED lighting device. It is a partially exploded front view of the LED lighting device. It is a principal part perspective view of the state which shifted the cover of the LED lighting apparatus. It is a front view of the state which shifted the cover and base part of the LED lighting apparatus. It is the VI-VI sectional view taken on the line of FIG. It is a top view of the base part of the LED lighting apparatus. It is a bottom view of the power supply circuit unit storage body of the LED lighting device. It is a block diagram which shows the circuit structure of the LED lighting apparatus. It is a graph which shows the measurement result of a temperature change test. It is a perspective view of the LED lighting apparatus which concerns on other embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the LED lighting device 1 includes a lamp body 2 and a lighting unit 3 attached to the lower surface side of the lamp body 2. In the description of the embodiment, as shown in FIG. 1, the upper side when the LED lighting device 1 is attached to the ceiling is the upper side in the LED lighting device 1, and the opposite direction is the lower side.

  As shown in FIGS. 3 to 5, the illumination unit 3 has a long plate-like LED substrate 5 on which a plurality of LEDs 6 are disposed, and an aluminum long plate-like shape with the LED substrate 5 attached to the lower surface. The base part 4 and a long cover 7 made of synthetic resin that covers the LED substrate 5 and is attached to the base part 4 are configured. The LED substrate 5 is a so-called aluminum base substrate based on an aluminum plate.

  A plurality of white LEDs 6 are arranged in a straight line on the lower surface of the LED substrate 5. Each LED 6 has a directivity angle of 120 ° and a luminous flux of 72 to 85 lm. The LED substrate 5 is screwed to the base portion 4, and the upper surface is bonded to the lower surface of the base portion 4 with a silicone adhesive having heat conductivity and time-curing properties. That is, as shown in FIG. 6, a cured adhesive layer 8 having thermal conductivity is formed between the upper surface of the LED substrate 5 and the lower surface of the base portion 4.

  As shown in FIG. 7, the base portion 4 has an elongated shape, and a plurality of locking portions 42 are provided on the upper surface 47 of the base portion 4. As shown in FIG. 3, each locking portion 42 has an elastic piece 42 a extending along the upper surface 47 with a slight gap between the upper surface 47.

  Further, as shown in FIG. 5, a board-side connector part 48 is fixed to the lower surface of one end part (left end part in FIG. 5) in the left-right direction of the base part 4, and the board-side connector part 48 is connected to the LED board 5. Has been.

  As shown in FIG. 6, the base portion 4 is formed with concave grooves 41 at both ends in the lateral direction (front-rear direction), and each concave groove 41 is formed on the base portion 4 as shown in FIG. The base portion 4 extends from the left end surface 43 to the right end surface 44 along the longitudinal direction. Specifically, the groove 41 formed in the front end portion of the base portion 4 is formed from the left end surface 43 of the base portion 4 to the right end surface 44 through the front end surface 45 (see FIG. 6), and the rear end of the base portion 4. The concave groove 41 formed in the portion is formed from the left end surface 43 of the base portion 4 to the right end surface 44 through the rear end surface 46 (see FIG. 6).

  The cover 7 is made of polycarbonate and has an elongated semi-cylindrical shape whose upper and left and right sides are open. As shown in FIG. 6, the inner surface 71 of the cover 7 has irregularities for diffusing light from the LEDs 6. Thus, the surface is a diffuse reflection surface. Specifically, the inner surface 71 is provided with a plurality of convex portions that are striped (straight) along the longitudinal direction (left-right direction) of the cover 7 and that have a triangular cross section when cut by a plane perpendicular to the longitudinal direction. It has been. In addition, between the convex parts adjacent to each other is a concave part.

  Both end portions 72, 72 in the front-rear direction of the cover 7 are bent in the inner direction of the cover 7. Then, the end portions 72 and 72 are fitted into the concave grooves 41 and 41 from the left end surface 43 or the right end surface 44 of the base portion 4 and are slid in the concave grooves 41 and 41, whereby the cover 7 is The LED board 5 is covered with the cover 7 by being mounted on the part 4. In this mounted state, as shown in FIG. 3, the upper surface 47 of the base portion 4 is exposed outside the cover 7.

  As shown in FIG. 6, the light diffusion sheet 9 made of synthetic resin that diffuses light from the LED 6 is provided on the inner surface 71 of the illumination unit 3 with a slight gap between the cover 7 and the inner surface 71. Are arranged along. The light diffusing sheet 9 is inserted between the cover 7 and the base part 4 through the opening on the side of the illumination part 3 in a state where the cover 7 is attached to the base part 4, thereby forming the shape of the cover 7. Is arranged along a curved line. In the present embodiment, the light diffusion sheet 9 is made of polyethylene terephthalate, and “Light-up (trademark or registered trademark)” manufactured by Kimoto Co. is used.

  As shown in FIG. 3, the lamp body 2 includes a power circuit unit housing 22 made of aluminum having a horizontally-long rectangular box shape with an open top, and screws on the left and right side walls of the power circuit unit housing 22. It consists of side covers 23 and 23 made of synthetic resin that are stopped and cover the left and right ends of the illumination unit 3.

  The power supply circuit unit housing 22 stores the power supply circuit unit 21 in an interior surrounded by left and right side walls, front and rear walls, and a lower wall. As shown in FIG. 8, the same number of locking holes 25 cut out in a rectangular shape as the locking portions 42 of the base portion 4 are formed in the lower wall portion of the power supply circuit housing 22. The position of the locking hole 25 corresponds to the position of the locking part 42 of the base part 4. Although not shown, a notch for taking out the wiring 27 extending from the power supply circuit 21 is formed on one of the left and right side walls of the power supply circuit housing 22. As shown in FIG. 5, a power supply side connector portion 26 is fixed to the lower surface of one end portion (left end portion in FIG. 5) in the left-right direction of the power supply circuit portion accommodating body 22, and the power supply side connector portion 26 is connected to the power supply circuit portion 21. It is connected to the. The power supply circuit unit 21 is connected to an external power supply via a wiring 27, and as shown in the circuit diagram of FIG. 9, the current from the external power supply is AC / DC converted into DC24V to be converted into each DC24V. It supplies to LED6 and each LED6 is light-emitted.

  As shown in FIGS. 4 and 5, the side cover 23 covers the left and right ends of the illumination unit 3 from below and from the sides (specifically, left side for the left end and right side for the right end). The cover portion 23a has a bottomed semi-cylindrical shape and a flat plate-like attachment portion 23b extending upward from the cover portion 23a. The attachment portion 23b is screwed to the left and right side wall portions of the power circuit portion housing body 22.

  When the lighting unit 3 is attached to the lamp body 2, as shown in FIG. 3, the side wall (on the left side in FIG. The side cover 23 is screwed to the side wall), and the opposite side cover 23 is removed. Then, with the cover 7 mounted on the base portion 4, as shown by the two-dot chain line arrow in FIG. 3, the locking portion 42 of the illumination unit 3 is inserted into the corresponding locking hole 25 of the power circuit unit housing 22. And slide it to the left. Then, the elastic piece 42 a is locked to the lower wall portion of the power circuit portion housing body 22 so as to sandwich the lower wall portion of the power circuit portion housing body 22, and the lighting unit 3 is mounted on the lamp body 2. At the same time, the board side connector portion 48 (see FIG. 5) is joined to the power source side connector portion 26 (see FIG. 5). In this state, the removed side cover 23 is placed on the side wall portion (the right side wall portion in FIGS. 3 and 5) on the side where the power supply side connector portion 26 of the power supply circuit portion housing 22 is not provided. Screw in. As a result, the illumination unit 3 is attached to the lamp body 2. Note that the side cover 23 on the side wall portion of the power supply circuit unit housing 22 where the power supply side connector portion 26 is not provided is removed, and the lighting unit 3 is slid in the direction opposite to that when the lighting unit 3 is mounted. If it does, each latching part 42 will remove | deviate from each latching hole 25, and the illumination part 3 can be removed from the lamp main body part 2. FIG.

  As shown in FIGS. 3 and 8, the lamp body 2 is provided with a plurality of screw attachment portions 28, and the upper edge of the lamp body 2 is brought into contact with an installation surface such as a ceiling to attach each screw. The lamp body 2 is fixed to the installation surface by inserting a screw into the screw hole 29 formed in the portion 28 and screwing it into the installation surface. When the LED lighting device 1 is installed on the installation surface, the lamp body 2 is fixed to the installation surface, and then the illumination unit 3 is mounted on the lamp body 2 as described above. Each LED 6 of the illumination unit 3 is supplied with a current from an external power supply via the power supply circuit unit 21 and emits light.

  According to the LED lighting device 1, the heat generated in each LED 6 is conducted from the LED substrate 5 to the base portion 4 via the adhesive layer 8 having thermal conductivity, and the upper surface of the base portion 4 and the lamp main body portion 2. Since it is in contact with the lower surface, it is conducted to the lamp body 2 via the base 4. Since the LED board 5 is based on aluminum and the base part 4 and the lamp body part 2 are made of aluminum, both are excellent in thermal conductivity. Therefore, since the heat of the LED 6 is quickly conducted to the base part 4 and the lamp body part 2 and is radiated by both the base part 4 and the lamp body part 2, the heat of the LED 6 can be sufficiently radiated, and the LED 6 has a long life. Can be maintained and power is not consumed for heat dissipation.

  Hereinafter, the temperature change test of the LED substrate 5 will be described. An LED substrate 5 mounted on the base portion 4 (but the cover 7 and the lamp body 2 are not mounted) is placed in a constant temperature and humidity chamber, and the surface (LED in FIG. For each of the bottom surface of the substrate 5 and the back surface (corresponding to the top surface of the base portion 4 in FIG. 6), a total of six temperatures were measured at the center portion and the left and right end portions in the longitudinal direction. . FIG. 10 shows the measurement results. “Ambient temperature 1” and “ambient temperature 2” in FIG. 10 are the ambient temperatures measured at two locations in the constant temperature and humidity chamber. "Substrate front left" is the front left end, "Substrate front center" is the front center, "Substrate front right" is the front right end, "Substrate back left" is the back left end, and "Substrate back center" is the back center. , “Substrate Back Right” represents the temperature at the right end of the back surface. In the test, as shown in FIG. 10, the ambient temperature was gradually raised from 25 ° C. to 50 ° C., further raised to 70 ° C., then lowered to 35 ° C., and then lowered to 25 ° C. Each LED 6 of the LED board 5 is turned on at P1 when the ambient temperature is stable at 25 ° C., and is turned off at P2 which is a temperature adjustment start time for raising the ambient temperature from 50 ° C. to 70 ° C. It turned on again at time P3, which is the temperature adjustment start time for lowering the temperature from 70 ° C to 35 ° C.

  From FIG. 10, the temperature at any point increases as the ambient temperature increases, but the ambient temperature + 15 ° C. even when each LED 6 is turned on except for “board surface center” and “board surface right”. It can be seen that sufficient heat dissipation is performed only by the base portion 4. In addition, about the “board front center” and “board front right”, because the resistance on the wiring is arranged in the vicinity, it is considered that the temperature has risen due to the influence, and the temperature rise is suppressed by the device of the wiring It seems possible.

  The illumination unit 3 has a long base 7 attached to a long base 4 to which a long LED substrate 5 is attached, and has the same appearance as a conventional straight tube fluorescent lamp. Have. And since the illumination part 3 is mounted | worn with the lamp main body part 2, and the lamp main body part 2 itself functions as a thermal radiation means, the LED lighting apparatus 1 does not need to provide an additional radiation fin. Therefore, it can be configured in the same manner as the appearance of a conventional straight tube fluorescent lamp. And since the lamp main body part 2 is provided with the power supply circuit part 21 connected with an external power supply and light-emitting each LED6, the LED lighting apparatus 1 is replaceable with the whole straight tube fluorescent lamp.

  In addition, since the LED substrate 5 is bonded to the base portion 4 with an adhesive having thermal conductivity, a minute gap between the LED substrate 5 and the base portion 4 is filled with an adhesive having thermal conductivity. As a result, heat is more easily transmitted from the LED substrate 5 to the base portion 4. If this point is not taken into consideration, the LED substrate 5 may be simply screwed to the base portion 4. Moreover, in this embodiment, although the silicone type adhesive agent was used, the adhesive agent which has another heat conductivity may be sufficient.

  Moreover, since the illumination part 3 is attached or detached by sliding to the left-right direction with respect to the lamp main body part 2, in the state which attached the LED lighting apparatus 1 to the ceiling, the illumination part 3 is the lamp main body part 2 with dead weight. There is no risk of coming off.

  When the illumination unit 3 is slid and attached to the lamp body 2, the board side connector unit 48 and the power supply side connector unit 26 are connected, so that the power supply circuit unit 21 is installed simultaneously with the installation of the illumination unit 3. Connection to the power supply circuit unit 21 and the LED board 5 is easy.

  Moreover, since the unevenness | corrugation which diffuses the light from each LED6 is formed in the inner surface of the cover 7, and the light from each LED6 is diffused, while being able to illuminate a wide area and reducing glare it can. In this embodiment, the directivity angle of each LED 6 is 120 °, but light is emitted in a range of about 180 °.

  Furthermore, since the light diffusing sheet 9 for diffusing the light from each LED 6 is arranged in the illumination unit 3 along the inner surface of the cover 7, the light from each LED 6 is also diffused by this and the wide area is illuminated. It is possible to reduce glare. Since the light diffusion sheet 9 is arranged with a slight gap (air layer) between the cover 7 and the light, the light from the LED 6 is diffusely reflected between the light diffusion sheet 9 and the cover 7. Will be diffused.

  In addition, from the temperature change test mentioned above, it turned out that the heat | fever of each LED6 can fully radiate | emit heat only by the base part 4. FIG. Therefore, the lamp body 2 may be a small one having a small heat capacity, for example, a slim type as shown in FIG. In the LED lighting device 1 </ b> B shown in FIG. 11, the width in the front-rear direction of the power supply circuit unit housing 22 of the lamp body 2 is the same as the width in the front-rear direction of the side cover 23. Others are configured similarly to the LED lighting device 1 described above. In addition, in FIG. 11, about the same component as the LED lighting apparatus 1, the same code | symbol as the LED lighting apparatus 1 is used. With such a slim illumination device 1B, it can be installed in a small space.

  Further, in the LED lighting device 1, the width in the front-rear direction of the lamp main body 2 may be enlarged so that two or more illumination units 3 can be attached to the lamp main body 2.

DESCRIPTION OF SYMBOLS 1, 1B ... LED illuminating device 2, 2B ... Lamp main-body part 3 ... Illumination part 4 ... Base part 5 ... LED board 6 ... LED
DESCRIPTION OF SYMBOLS 7 ... Cover 8 ... Adhesive layer 9 ... Light diffusion sheet 21 ... Power supply circuit part 25 ... Power supply side connector part 48 ... Board side connector part

Claims (6)

A lamp body provided with a power circuit section housing made of aluminum, and an illumination section removable from the lamp body,
The illumination unit is
An elongate LED substrate on which an LED is disposed based on an aluminum plate;
A long base made of aluminum with the LED substrate attached to the lower surface;
A long cover that is mounted on the base portion so as to expose at least the upper surface of the base portion and covers the LED substrate;
With
The power supply circuit unit accommodating body, accommodating a power supply circuit for converting an alternating current is connected to an external AC power source into a direct current to emit the LED,
In a state where the illumination section is attached to the lamp body unit, together with the upper surface of the base portion comes into contact with the lower surface of the power supply circuit unit container, between the lower surface of the cover and the power supply circuit unit accommodating body The LED lighting device, wherein the side end surface along the longitudinal direction of the base portion is exposed .   The LED lighting device according to claim 1, wherein the LED substrate is bonded to the base portion with an adhesive having thermal conductivity.   The LED lighting device according to claim 1, wherein the illumination unit is attached and detached by sliding in the left-right direction with respect to the lamp main body. A board-side connector part provided in the illumination part and connected to the LED board;
Provided in the lamp body part, and connected to the power supply circuit part power supply side connector part,
The board side connector part and the power source side connector part are connected when the lighting part is slid with respect to the lamp body part and attached to the lamp body part. The LED lighting device according to claim 3, wherein:   5. The LED illumination device according to claim 1, wherein unevenness for diffusing light from the LED is formed on an inner surface of the cover.   6. The LED lighting device according to claim 1, wherein a light diffusing sheet for diffusing light from the LEDs is disposed along the inner surface of the cover. .

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